Depends on the collar. Depends on the occasion. For free time or sprezzatura (Italian elegance) you should choose the simplest one - four in hand. For formal occasion or with wide collar you can consider windsor or half windsor.

Classic four-in-hand also known as "simple knot". You can use it with wider tie as well. It's a part of italian sprezzatura (but we'll talk about it later). People with good fashion orientation, can use it even with cutaway collar.

I recommend download app "How to tie a tie" on your smartphone, which is still with you. Otherwise completely amazing pictures are on the site ties.com. They are really amazing and because I don't want to steal, rather use the link. :)